CN2033163U

CN2033163U - Manual or automatic resetting multi-functional electricity-getting protecter

Info

Publication number: CN2033163U
Application number: CN 88202380
Authority: CN
Inventors: 徐国亮
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-03-02
Filing date: 1988-03-02
Publication date: 1989-02-22

Abstract

The utility model discloses a device with the function of protecting single-phase electric shock, two-phase electric shock and overload. The primary side of a current mutual inductor of a signal detecting element is provided with an additional winding, and the magnetic potential generated by the winding is just counteracted with the magnetic potential generated by a fire-wire winding. When someone generates single-phase electric shock, two-phase electric shock or overload, the synthetic magnetic potential of the two windings is not zero, the secondary side of the mutual inductor generate induced voltage which is amplified through an amplifying circuit to start an operating mechanism, and then a power supply is rapidly cut off so that the utility model performs a protective action.

Description

Manual or automatic resetting multi-functional electricity-getting protecter

The utility model relates to a kind of improved electric protective device, and it not only shields to single-phase electric shock, and electric shock also shields to two-phase under certain condition, also has functions such as overload protection, breaking protection and pressure regulation simultaneously.When some home electrical heaters and the utility model are used, also can realize overtemperature protection or thermostatic control.

Existing family expenses electric protective device (electric current action type) is to detect the leakage current signal by zero sequence current mutual inductor; through the amplifying circuit amplification actuator's action is played a protective role; but; when the two-phase electric shock takes place in the people; there is no leakage current generating; the zero sequence current mutual inductor secondary can not produce induced voltage like this, and then actuator can not move, and this has just lost its protective effect.

Task of the present utility model is finished as follows: establish an additional winding on its former limit of signal detection component current transformer; the magnetic potential that magnetic potential that this winding produces and fiery winding produce is just in time offset; single-phase electric shock takes place as the people; when two-phase electric shock or overload; the electric current that flows through the live wire winding increases; the composite magnetic power that then additional winding and live wire winding produce no longer is zero; the secondary of instrument transformer just produces induced voltage; after amplifying, amplifying circuit makes actuator's action, instantaneous trip power supply and playing a protective role.

Below with reference to accompanying drawing two kinds of embodiments of the present utility model are explained in detail:

Fig. 1: the basic circuit diagram of the multi-functional electric protective device of hand-reset formula.

Fig. 2: the profile schematic diagram of the multi-functional electric protective device of hand-reset formula.

Fig. 3: the basic circuit diagram of the multi-functional electric protective device of the formula that automatically resets.

With reference to Fig. 1, the former limit of signal detection component current transformer H is made up of winding L 1, L2, L3, and L1 is the live wire winding, and L2 is the zero line winding, and L3 is additional winding, energising and the outage of double-pole switchette K1 control winding L 2 and L3.During work, the 2AN that presses button, permanent magnet holds armature, drives the K3 closure, connects load power source.When K1 is in " 1 " shelves, L3 outage, the L2 energising, the former limit winding L 1 of instrument transformer H, L2 are in running order, and at this moment, the working condition of this protector is the same with the working condition that has protector at present now.When load during for stable resistive load, K1 is allocated to putting " 2 " by the position set, just can realize the kinds of protect function; After K1 is allocated to " 2 " shelves by " 1 " shelves, disconnect the power circuit of L2, connect A, B 2 points, to electric, K1 also connects the current supply circuit of L3 to power supply simultaneously by electric wire BC, and at this moment, the former limit winding L 1 of instrument transformer H, L3 are in running order; Resistance R 1 is connected in the current supply circuit of L3 with adjustable resistance R2, adjusts the resistance of resistance R 2, can change the size by winding L 3 electric currents; When resistance R 2 is adjusted to the appropriate location, just in time offset by the magnetic potential that L1 produces with load current by the magnetic potential that the L3 electric current produces, the non-inductive voltage of secondary L4 of H then, this protector is in the normal power supply state at this moment; Single-phase electric shock takes place as the people; when two-phase electric shock or overload; electric current by L1 increases, and the magnetic potential that the L1 winding produces correspondingly increases, and then the composite magnetic power of L1 and L3 no longer is zero; in the time L4 go up to produce induced voltage; the amplifying circuit that BG1, BG2, BG3, BG4 form on transistor amplifies, and makes the electric current by circuit breaker JD coil produce the magnetic field of cancelling out each other with permanent magnet, and armature discharges immediately; K3 disconnects, instantaneous trip power supply and playing a protective role.If when open circuit fault took place, the last no current of L1 passed through, the composite magnetic power of L1 and L3 is exactly the magnetic potential that produces by the L3 electric current, and then L4 goes up and produces induced voltage, and the result makes actuator's action, thereby realizes breaking protection.Electric blanket causes that fire incident takes place often, if electric blanket and this device are used, just can avoid the generation of accident.Its implementation is; in electric blanket, arrange the temperature-sensitive element of the negative temperature coefficient parallel with one another with it; because the rising of temperature; cause diminishing and the increase of load current of resistance; when temperature surpasses certain value; the load current of corresponding increase makes the action of this protector, thereby realizes overtemperature protection, avoids the generation of accident.This protector is provided with the regulator of K switch 2 and diode D1 composition, can realize when some electric heating appliances and this device are used like this heating up and preservation and controlling.1AN is the test button, is used for the working condition of check protection device.

The arrangements of elements of the multi-functional electric protective device of hand-reset formula is in socket box shown in Figure 2, and all the element cost is no more than 10 yuan.It has making easily, and debugging is convenient, and characteristics such as one-object-many-purposes are practical especially in family.

With reference to accompanying drawing 3, this apparatus features is to cut off the electricity supply that switch automatically resets after a period of time, power turn-on, and do not need manually to finish.The composition of its signal deteching circuit and working condition and above-mentioned hand-reset formula protector just the same no longer repeats here.Below its work characteristics is illustrated slightly.Instrument transformer H and resistance R 4, R5, capacitor C 2, diode D1 forms signal deteching circuit, integrated package SGZO1 and resistance R 6,4 groups of signals of capacitor C are differentiated, amplify and shaping circuit, resistance R 7, R8, voltage-stabiliser tube D2 and triode BG form electronic switching circuit, ic chip 2 with resistance R 10, adjustable resistance R9, capacitor C 7 is formed the monostable time delay circuit, adjust R9 and can change delay time, relay EJ is an actuator, its contact is directly controlled on/off, the dc supply of circuit by 220 volts of alternating currents through transformer B step-down, full-bridge D4 rectification, capacitor C 6 filtering are supplied with.When K1 is in " 1 " shelves; single-phase electric shock takes place; or during overload; all there is induced voltage to produce on the H secondary L4; when this voltage reach IC1 input action voltage (5～25mv) time, IC1 pin 5 output high level, D2 is breakdown; BG obtains bias current and saturation conduction; the pin 2 of IC2 becomes low level by high level, EJ adhesive, deenergization and playing a protective role immediately; at this moment the C7 in the delay circuit passes through R9; R10 begins charging; IC2 pin 6 current potentials are constantly risen, and the monostable circuit upset is resetted, at this moment IC2 pin 3 recovers low level again; EJ discharges, and restores electricity.If this moment, fault still existed, this protector repeats said process again.Capacitor C 1 is in parallel with B, and purpose is to reduce the influence of inductive load to this circuit.When if electric blanket and this device are used, also can realize thermostatic control.Its implementation is, in electric blanket, arrange the temperature-sensitive element of the negative temperature coefficient parallel with one another with it, when temperature rises to predetermined value, because the increase that causes electric current that diminishes of resistance makes this device action, cuts off the electricity supply, behind suitable time-delay, EJ is adhesive again, restore electricity, repeat said process then, thereby realize thermostatic control.

Automatically the multi-functional electric protective device of homing position type has that circuit is simple, reliable operation; the characteristics such as cost is low, multi-functional; home electrical heater only need increase the temperature-sensitive element of a suitable negative temperature coefficient; just be used with this device and can realize thermostatic control; therefore; the appearance of this protector has great significance to the cost that reduces the electric heating tool.

Claims

1, a kind of hand-reset formula and the multi-functional electric protective device of the formula that automatically resets is characterized in that, the former limit of signal detection component current transformer H is by the live wire winding L ₁, the zero line winding L ₂, additional winding L ₃Form, wherein L ₃Power circuit in string resistance R arranged ₁With adjustable resistance R ₂

2, a kind of hand-reset formula and the multi-functional electric protective device of the formula that automatically resets is characterized in that, this protector is equipped with a small capacity double knife switch K1, and wherein the last terminals of K1 and A point link, and following terminals link with winding L 2, L3, electric wire BC respectively.

3, the multi-functional electric protective device of a kind of manual type homing position type is characterized in that, is provided with regulator, and this device is made up of K switch 2, diode D1.

4, the multi-functional electric protective device of a kind of formula that automatically resets; it is characterized in that; by current transformer H detection signal; after carrying out signal discriminating, amplification, shaping, the circuit that ic chip 1 and resistance R 6, capacitor C 4 are formed acts on the switching circuit; trigger the monostable circuit of forming by ic chip 2, resistance R 9, R10, capacitor C 7 by switching circuit then, make actuator's action.

5, protector according to claim 4 is characterized in that, switching circuit is made up of triode BG, resistance R 7, R8, voltage-stabiliser tube D2.